According to San Miguel assistant coach Peter Martin, there’s only three constant things in this world: Death, taxes, and all PBA teams playing well against the Beermen.And that’s exactly the mentality SMB is taking ahead of its marquee matchup against TNT in the Season 50 Governors’ Cup at the Mall of Asia Arena on Saturday, Aug. 1.The Beermen are expecting no less than a dogfight against the Tropang 5G even with the defending champion playing …